高手帮忙了！！验证码跟着敲好之后 服务器打开一个小方块里面空的！在线等！！！
<?php
require_once 'string.func.php';
//通过GD库做验证码
//创建画布
$width=80;
$height=28;
$image=imagecreatetruecolor($width,$height);
$white=imagecolorallocate($image,255,255,255);
$black=imagecolorallocate($image,0,0,0);
//用填充矩形填充画布
imagefilledrectangle($image,1,1,$width-2,$height-2,$white);
$type=1;
$length=4;
$chars=buildRandomString($type,$length);
$sess_name="verify";
$_SESSION[$sess_name]=$chars;
$fontfiles=array("msyh.ttc","msyhbd.ttc","msyhl.ttc","simhei.ttf","simkai.ttf");
for($i=0;$i<$length;$i++){
$size=mt_rand(14,18);
$angle=mt_rand(-15,15);
$x=5+$i*$size;
$y=mt_rand(20,26);
$fontfile="../fomts/".$fontfiles[mt_rand(0,count($fontfiles)-1)];
$color=imagecolorallocate($image,mt_rand(50,90),mt_rand(80,200),mt_rand(90,180));
$text=substr($chars,$i,1);
imagettftext($image,$size,$angle,$x,$y,$color,$fontfile,$text);
}
header("content-type:image/gif");
imagegif($image);
imagedestroy($image);
